3.4 The AB Chrysalls

The Moon starts being bombarded by destructive shockwaves at regular intervals; each time with increasingly deadly force. Koenig, Carter and Maya set out to determine both their reason and source and discover a planet with a ring of protective moons which periodically emit the powerful charges. But who or what are they protecting and can the next shockwave be delayed until the moon is safely past the planet or will it go forward and destroy Moonbase Alpha and all its inhabitants?